<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
  <h1> <a href="/crud/insert">增加</a></h1> <br>
  <h1> <a href="/crud/update">修改</a></h1> <br>
  <h1> <a href="/crud/delete">删除</a></h1> <br>
  <h1> <a href="/crud/select">查询</a></h1> <br>
</body>
</html>